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3 STANDARD SPRINKLE K FACTORS, ORIFICE AND THREAD SIZES

3 STANDARD SPRINKLE K FACTORS, ORIFICE AND THREAD SIZES

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AS 2118.1—1999

80

6.6 COLOUR CODING
The colour code given in AS 4118.1.1 shall be used to distinguish sprinklers of different
nominal temperature ratings.
6.7 STOCK OF REPLACEMENT SPRINKLERS
A stock of spare sprinklers, with the necessary spanners, shall be supplied for the system so
that sprinklers that have been activated, or that have been damaged in any way, can be
promptly replaced.

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The spare sprinklers and spanners shall be located on the premises in an accessible
designated position, which shall be indicated on the block plan (see Clause 8.3), and where
the ambient temperature does not exceed 38°C.
NOTE: The number of spare sprinklers to be kept on the premises will depend on the hazard class
of the system and the types and temperature ratings of the sprinklers installed.
As a general guide the number of spare sprinklers of standard temperature ratings should be as
follows:
(a) Light Hazard system ....................................................................................... 6 sprinklers.
(b) Ordinary Hazard system ................................................................................ 24 sprinklers.
(c) High Hazard system ...................................................................................... 36 sprinklers.
Should the systems include sprinklers of high temperature ratings, for example in boiler rooms or
drying ovens, an adequate number of spare sprinklers of the appropriate temperature rating should
also be kept on the premises. Similarly if the systems include sidewall or other special type
sprinklers or if there are any multiple controls, an adequate number of spares should be kept on
the premises.
Spares should be replenished immediately after an incident. Advice should be sought regarding
the possible necessity of replacing sprinklers on the perimeter of the area which, although they
have not operated, may have been affected by heat.

6.7.1 Special sprinklers
Where special sprinkler systems are installed, a stock of spare special sprinklers, suitable
for the purpose, shall be kept on the premises.
6.8 ANTI-CORROSION TREATMENT OF SPRINKLERS
Sprinklers used in bleach, dye and textile print works, alkali plants, organic fertilizer plants,
foundries, pickle and vinegar works, electroplating and galvanizing works, paper mills,
tanneries and in any other premises or portions of premises where corrosive vapours are
prevalent, shall have corrosion-resistant coatings or shall be coated twice with a good
quality petroleum jelly. The first coat shall be applied before installation and the second
shall be applied after installation.
NOTE: Coatings need to be renewed at periodic intervals as may be necessary but only after the
existing coatings have been thoroughly wiped off. For glass-bulb-type sprinklers, the
anti-corrosion treatment need only be applied to the body and yoke.

6.9 SPRINKLER GUARDS
Where sprinklers are installed in locations where they are likely to suffer mechanical
damage, they shall be fitted with metal guards. Guards shall be designed so as not to
interfere with the normal spray pattern of the sprinkler. Guards shall not be used with flush,
recessed or concealed-type sprinklers.

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81

AS 2118.1—1999

6.10 ESCUTCHEON PLATE ASSEMBLIES
Escutcheon plate assemblies fitted to sprinklers shall be of metal and securely attached so
that they cannot slip down and adversely affect activation or the water discharge pattern of
sprinklers.
Recessed escutcheon plate assemblies shall only be used with sprinklers that have been
listed for such mounting (see Clause 6.2.1(d)).
C6.10 Non-metallic escutcheon plate assemblies may deteriorate with age or distort
during fire conditions and interfere with the effective operation of the sprinkler.
6.11 PROTECTION AGAINST FROST

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Sprinklers shall not be wrapped or enclosed in any material for protection against frost.

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AS 2118.1—1999

82

S E CT I ON

7

PI P I NG

7.1 PIPE AND PIPE FITTINGS
All pipes and pipe fittings in a sprinkler installation shall be new and shall comply with the
requirements of AS 2118.9 and AS 4118.2.1.
7.2 HYDRAULIC TEST PRESSURE
All new installations, trunk mains and water supply connections shall be capable of
withstanding a hydraulic test pressure as specified in Section 3 of AS 2118.9.
7.3 PIPING IN NON-SPRINKLER-PROTECTED BUILDINGS

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With the exception of concealed spaces not requiring protection as permitted in Clause 5.6,
sprinkler piping shall not pass through buildings or areas not protected by sprinklers unless
it is enclosed by a construction having an FRL of not less than –/120/120.
7.4 HAZARDOUS
PROCESSES
AND
EXPLOSION
PRECAUTIONS CONCERNING PIPING AND VALVES

HAZARD — SPECIAL

In buildings or sections of premises in which protection from explosion is required, the
following special precautions shall be taken:
(a)

Separate control assemblies shall be provided to control the sprinklers and shall be
located either—
(i)

in a structure separated from the hazardous building by a distance not less than
6 m; or

(ii)

where this is not practicable, in an enclosure separated from the hazardous
building by imperforate concrete or masonry walls and roof with an FRL of not
less than –/120/120. When this enclosure is recessed in an external wall of the
building that does not have a fire-resistance level, a return wall 3 m long and
the same height as the enclosure, with an FRL not less than –/120/120, shall be
provided on each side. Sole access to the valve enclosure shall not be through
the hazardous area.

(b)

Trunk mains leading to and from such installation shall be either carried external to
the buildings concerned or adequately protected from damage arising from building
collapse following an explosion (see Clause 7.3).

(c)

Water supplies such as pumps, pressure tanks or gravity tanks shall not be housed
therein.

7.5 SLOPE OF PIPES FOR DRAINAGE
Sprinklers forming part of dry or alternate wet and dry systems shall be so installed that the
system can be thoroughly drained. Range piping shall have a slope of not less than 4 mm in
1 m, and distribution piping shall have a slope of not less than 2 mm in 1 m.
NOTE: Piping in all systems including piping in wet systems should be arranged to drain to the
installation drain valve which should be not less than DN 50 in diameter for Ordinary and High
Hazard systems and not less than DN 40 in diameter for Light Hazard systems.

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83

AS 2118.1—1999

7.6 LOW LEVEL DRAINAGE
In basements and other areas where sprinkler piping is below the installation drain valves
and in other trapped sections in the system, auxiliary drain valves of the following
minimum sizes shall be provided:
(a)

For pipes up to 50 mm in diameter .................................................................20 mm.

(b)

For 65 mm diameter pipes .............................................................................25 mm.

(c)

For pipes larger than 65 mm in diameter ........................................................32 mm.

7.7 PIPE SIZES
Pipe size shall be determined either by full hydraulic calculation (see Section 12), or partly
by pre-calculated pipe size tables and partly by hydraulic calculations in accordance with
the requirements for the class of hazard (see Clauses 9.5, 10.4 and 11.4).

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7.8 ORIFICE PLATES
Orifice plates fitted to assist in hydraulically balancing a High Hazard class system or to
meet pump characteristic curves shall have an orifice diameter of not less than 50% of the
diameter of the pipe into which the plate is to be fitted and shall comply with the
requirements of Appendix C. Such orifice plates shall be permitted only in pipes of 50 mm
in diameter or larger.
7.9 SUPPORT OF SPRINKLER PIPING
When a pipe support system is being designed for a standard fire sprinkler system,
consideration shall be given to the correct location of pipe supports and to—
(a)

the stresses and loads which may be imposed on the support system from all external
causes including differential movement of the building structure and all internal
causes including pressure reactions;

(b)

the transmission of vibration from the building to the piping and from the piping to
the building; and

(c)

the effect a corrosive atmosphere may have on the materials used.

Fire sprinkler piping support systems shall comply with the requirements specified in
AS 2118.9.

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